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EnumNamingStrategies (#4728)
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463 changes: 405 additions & 58 deletions
463
src/main/java/com/fasterxml/jackson/databind/EnumNamingStrategies.java
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157 changes: 157 additions & 0 deletions
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src/main/java/com/fasterxml/jackson/databind/util/NamingStrategyImpls.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| package com.fasterxml.jackson.databind.util; | ||
|
|
||
| /** | ||
| * Container for standard naming strategy implementations, specifically | ||
| * used by property naming strategies (see {@link com.fasterxml.jackson.databind.PropertyNamingStrategies}) | ||
| * and enum naming strategies (see {@link com.fasterxml.jackson.databind.EnumNamingStrategies}). | ||
| */ | ||
| public enum NamingStrategyImpls { | ||
| /** | ||
| * beanName -> beanName | ||
| */ | ||
| LOWER_CAMEL_CASE { | ||
| @Override | ||
| public String translate(String beanName) { | ||
| return beanName; // beanName is already in lower camel case | ||
| } | ||
| }, | ||
|
|
||
| /** | ||
| * beanName -> BeanName | ||
| */ | ||
| UPPER_CAMEL_CASE { | ||
| @Override | ||
| public String translate(String beanName) { | ||
| if (beanName == null || beanName.isEmpty()) { | ||
| return beanName; // garbage in, garbage out | ||
| } | ||
| // Replace first lower-case letter with upper-case equivalent | ||
| char c = beanName.charAt(0); | ||
| char uc = Character.toUpperCase(c); | ||
| if (c == uc) { | ||
| return beanName; | ||
| } | ||
| StringBuilder sb = new StringBuilder(beanName); | ||
| sb.setCharAt(0, uc); | ||
| return sb.toString(); | ||
| } | ||
| }, | ||
|
|
||
| /** | ||
| * beanName -> bean_name | ||
| */ | ||
| SNAKE_CASE { | ||
| @Override | ||
| public String translate(String beanName) { | ||
| if (beanName == null) return beanName; // garbage in, garbage out | ||
| int length = beanName.length(); | ||
| StringBuilder result = new StringBuilder(length * 2); | ||
| int resultLength = 0; | ||
| boolean wasPrevTranslated = false; | ||
| for (int i = 0; i < length; i++) { | ||
| char c = beanName.charAt(i); | ||
| if (i > 0 || c != '_') // skip first starting underscore | ||
| { | ||
| if (Character.isUpperCase(c)) { | ||
| if (!wasPrevTranslated && resultLength > 0 && result.charAt(resultLength - 1) != '_') { | ||
| result.append('_'); | ||
| resultLength++; | ||
| } | ||
| c = Character.toLowerCase(c); | ||
| wasPrevTranslated = true; | ||
| } else { | ||
| wasPrevTranslated = false; | ||
| } | ||
| result.append(c); | ||
| resultLength++; | ||
| } | ||
| } | ||
| return resultLength > 0 ? result.toString() : beanName; | ||
| } | ||
| }, | ||
|
|
||
| /** | ||
| * beanName -> BEAN_NAME | ||
| */ | ||
| UPPER_SNAKE_CASE { | ||
| @Override | ||
| public String translate(String beanName) { | ||
| String output = SNAKE_CASE.translate(beanName); | ||
| if (output == null) { | ||
| return null; | ||
| } | ||
| return output.toUpperCase(); | ||
| } | ||
| }, | ||
|
|
||
| /** | ||
| * beanName -> beanname | ||
| */ | ||
| LOWER_CASE { | ||
| @Override | ||
| public String translate(String beanName) { | ||
| if (beanName == null || beanName.isEmpty()) { | ||
| return beanName; | ||
| } | ||
| return beanName.toLowerCase(); | ||
| } | ||
| }, | ||
|
|
||
| /** | ||
| * beanName -> bean-name | ||
| */ | ||
| KEBAB_CASE { | ||
| @Override | ||
| public String translate(String beanName) { | ||
| return translateLowerCaseWithSeparator(beanName, '-'); | ||
| } | ||
| }, | ||
|
|
||
| /** | ||
| * beanName -> bean.name | ||
| */ | ||
| LOWER_DOT_CASE { | ||
| @Override | ||
| public String translate(String beanName) { | ||
| return translateLowerCaseWithSeparator(beanName, '.'); | ||
| } | ||
| }, | ||
| ; | ||
|
|
||
| public abstract String translate(final String beanName); | ||
|
|
||
| /** | ||
| * Helper method to share implementation between snake and dotted case. | ||
| */ | ||
| static String translateLowerCaseWithSeparator(final String beanName, final char separator) { | ||
| if (beanName == null || beanName.isEmpty()) { | ||
| return beanName; | ||
| } | ||
|
|
||
| final int length = beanName.length(); | ||
| final StringBuilder result = new StringBuilder(length + (length >> 1)); | ||
| int upperCount = 0; | ||
| for (int i = 0; i < length; ++i) { | ||
| char ch = beanName.charAt(i); | ||
| char lc = Character.toLowerCase(ch); | ||
|
|
||
| if (lc == ch) { // lower-case letter means we can get new word | ||
| // but need to check for multi-letter upper-case (acronym), where assumption | ||
| // is that the last upper-case char is start of a new word | ||
| if (upperCount > 1) { | ||
| // so insert hyphen before the last character now | ||
| result.insert(result.length() - 1, separator); | ||
| } | ||
| upperCount = 0; | ||
| } else { | ||
| // Otherwise starts new word, unless beginning of string | ||
| if ((upperCount == 0) && (i > 0)) { | ||
| result.append(separator); | ||
| } | ||
| ++upperCount; | ||
| } | ||
| result.append(lc); | ||
| } | ||
| return result.toString(); | ||
| } | ||
| } |
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